Improvement in sewing-machines



I. W. LAMB. SEWING MACHINE.

2 Sheets-Sheet 1.

K Patented Nov. 29, 1870 uveutnr: JKM! gtturuegn.

2 Sheets-Sheet 2. I, LAMB. SEWING MACHINE.

No. 109,632. Patented Nov. 29, 1870.

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etait-tt tuta iti @fitte Leners Patentino. 109,632, aan Novembas, 1870.

IMPROVEMENT IN stimule-MACHINES.

The Schedule refex'red to in these Letters Patent and making part of the same.

To all whom it may concern:

Bc it known that I, ISAAC lV. LAMB, of Northville, in the county of \Vayne and State of Michigan, have invented a new and useful Improvement 'n1 Sewingilachines; and I do hereby'declare that the following is a full, clear, and exact description thereof', which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of lthis specification.

Figure l represents a side view, partly in section, of my in'lproved sewing-machine.

Figure 2 is an inverted plan view ofthe sal-ne.

Figure 3 is a frontview, partly in section, of the same.

Figure 4 is a detail horizontal section, on an enlarged scale, of the shuttle mechanism.

vFigure 5 is a diagram illustra-ting the kind of stitch made by my machine.

Figures 6, 7, and 8 are detail the formation of the stitch.

Figure 9 is a det-ail planvicw, partly in section, of the shuttle.

Similar letters of reference indicate corresponding parts.

This invention has for its object the construction side views, showing of a machine, by which, -with one single thread, a'-

stitch can be produced which has every new loop put first around and then through the previous loop, un-

der the fabric; therebya succession of loops is'fo'rmed which will be securely locked together, and which, with but one single'thread, will be fully as reliable as the stitches made by two or more threads.

In iig. 5, the loop made. by the machine is fully illustrated. ln it a is 'the 4new loop, and b the one made previous to a.

It will be seen that thc new loop is first pnt around and then through' the loop b, or that the old loop b is rst pnt through a, and then a through b.

llhe present invention also consists in the constrncv tion and arrangement of various details of machinery employed for the aforesaid purpose.

The main difference between my machine and those now in use consists in the looping mechanism, and in the eniployment'of a powerful take-up for the thread.

lhe looping mechanism consists of a straight or curved needle, A, which is attached to a suitable reciprocating or oscillating needle-holder, B, and of a lower needle or looper, C, which is carried by a reciprocating chaser or shuttle, D.

The looper C is made in'forzu of a latch-needle,

similar in form to a'knitting-machine needle, it having a pivoted latch c and a hook, d, at one end, and

a hook-shaped shank, e, at the other end. The stitchis produced in the following manner: lhe first position is that shownin g.'6. In this the said catch.

the needle A has just been passed through the fabric,

and has carriedits thread down below the same, forming the loop a.

The loop b, previously made, is o n the hook-shaped shank e oi' the looper. The looper in this is in its extreme left or backward position.

The needle A isnow beiugdrawn np, and the looper moves tof the right,or forward; the shank e of the looper is thereby' carried through the new loop a. on the needle, and the old loop l1 is also carried through such new loop, as shown in g. 7.

lhe latch c, during the position shown in figs. 6 and 7, is open, asV shown, and the loop b forward of The new loop is thus placed around thel old loop.

As the looper continues to move forward the old 'loop causes the latch to swing-closed, as in iig. 8;A

previous to this, however, the new loop was drawn up into the hook l of the looper. As the latch is closed it locks the new loop in the looper. The further-provided motion of the looper causes the old loop to slip over the latch, and consequently also over the new loop, and thereby to become entirely disengaged from the mechanism of the-machine. Thus the new loop was first put around and .thenv through the old loop, or, in other words, the oldloop was first put through the new and then thenew through the old, as in fig. 5.

As the needle A descends again, the looper moves backward, or to the left, and the loop a takes theplaceformerly occupied by the loop b.

The operation is repeated for each stitch, and whenever the looper draws the old loopthrough the new one it hooks thenew and throws off the old loop, thereby causing the new loop to be also drawn through the old one.

The looper, it will be seen, operates` in a manner very similar to the action of an ordinary shuttle, with the exception of the latch action.

In order to secure the latch in the open position shown in figs. 6 and 7, I employ a latch-opener, E, which `is on a pivoted bar, and which ts with its point under the latch, as is clearly shown in figs. 6 and 7, to hold it open.

It also serves to open the latch when the looper makes itsbackward stroke.

The latch-opener has a slight transverse motion,

whichit receives by a movable plate, f, from a cam,l

g, on the main operatiu g shaft F, and from a spring, h..

The looper, as aforesaid, is fitted into and guided by a carrier, D, which is made yL-shaped in cross-section, as'infig. 1.

The thick 4lower part is slotted to receive the end of the looper-shank e.

' The slot in the carrier is long enough to allow it mkefup springd,

to move about one-fourth'of an inch before it will carry the looper along in either direction. The object of thus shortening the motion of the looper is to preventthe drawing of along loop during the backward stroke of the looper, and to allow the carrier to operi the needle-loop well before the looper enters it during the forward stroke.,

In'the first portion of making the loop, g. 6, the carrier is drawn back some distance from the needle while the shank of the looper is near to the needle, as shown. the needle-loop, opening the same, the looper remaining stationary. A

A spring, t', ou the latchopener, holds the vlooper back while the carrier is thus moved.

When the carrier has opened the needle-loop it draws the looper along with it, and carries it also through the loop into the second position of fig. 7. Then the loop or thread is drawn up by a suitable on the needle-arm B, and the said loop is rapidly drawn up on Vthe rounded' back edge of the carrier.

The action of the take-up spring, together with .the said rounded end of the carrier, has the effect of properly drawing up the needle-loop before the. closing of the latch,- and without arresting the motion of the' looper.

'lhe carrier is operated by a reciprocating slide, n(Sr, which receives its motion by an oscillating lever, H, which is moved by a crank on the shaft F.

In the slide G are two pins ZI, connected with each other by a lever, I, which is pivotcd by a pin, K, to

'the slide.

- The pins l fit with their ends into apertures u'hich are provided in the carrier, as shown in fig. 4.

As the slide moves back and forth, thc outer ends of the pins l fit against the edges of a stationary cam, J, which edge is so formed that one pin, l, will be thrown in and the other brought out of the carrier alternately.

The carrier is then started, and moves into motion of the looper,

sists in the use of devices for producing the peculiar single-threaded stitch.

The feed mechanism may be of any suitable construction, the same not forming part of my invention.

The latch-opener E may, if desired, be made st..- tonary, especially when other forms of loopers are employed.

" Having thus described my invention,

,\Vhat I claim as new, and desire to secure by Letters Patent, is

1. A sewing-machine, arranged to produce,with one single thread, a stitch, in which every new loop is rst pnt around and then through the preceding loop, substantially `as herein shown and described.

2. The carrier I), in combination with thelooper C, having a hook, d, and latch c, when constructed and operating substantially as herein shown and described.

3. The latch -opener E, arranged in combination with the looper C, substantially as here shown and described, tQ-operate as set forth.

4. rlhe spring formed on the 1atch-opener, for the purpose of holding the looper while the carrier advances, as set forth.

ISAAC W. LAMB.

Witnesses:

ISAAC PLACE, W1 LLIAM Comms. 

